Electrolyte and lithium ion battery containing the electrolyte and/or positive electrode

An electrolyte and cathode technology, applied in battery electrodes, secondary batteries, organic electrolytes, etc., can solve the problems of high viscosity, excessive consumption of electrolyte solvent, low conductivity, etc., and achieve the effect of prolonging life.

Active Publication Date: 2018-11-02
HUIZHOU BYD BATTERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many studies on new electrolytes, most of which replace existing systems with new solvents, but there are disadvantages such as low conductivity or high viscosity
However, in the existing technology, there is a technical problem that the electrolyte solvent undergoes an oxidation reaction with the active points on the positive electrode at a high potential, and the solvent is further oxidized and decomposed, resulting in excessive consumption of the electrolyte solvent.

Method used

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  • Electrolyte and lithium ion battery containing the electrolyte and/or positive electrode
  • Electrolyte and lithium ion battery containing the electrolyte and/or positive electrode
  • Electrolyte and lithium ion battery containing the electrolyte and/or positive electrode

Examples

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preparation example Construction

[0034] The preparation method of the lithium-ion battery electrolyte provided by the present invention is a common method for those skilled in the art, that is, to mix the components (including lithium salt, electrolyte solvent and additives) uniformly, and the mixing method and sequence of the present invention None of them are particularly limited.

[0035] The electrolyte additive of the present invention may also contain other substances, such as other types of functional additives, which are not limited in the present invention.

[0036] The present invention also provides a lithium-ion battery, comprising a casing, an electric core contained in the casing, and an electrolyte, the electric core includes a positive electrode, a negative electrode, and a separator between the positive electrode and the negative electrode, wherein the electrolyte is The electrolyte solution and / or the positive electrode provided by the present invention is the positive electrode provided by th...

Embodiment 1

[0042] (1) Preparation of electrolyte:

[0043] In an argon glove box, ethylene carbonate (EC), diethyl carbonate (DEC), 12% by weight lithium hexafluorophosphate (LiPF 6 ) is dissolved in 100% by weight of the electrolyte solvent, and then 0.1% by weight of 2-chlorobenzothiazole (the benzothiazole of the structure shown in the application formula (1), wherein R is -Cl) is added to obtain this The lithium ion battery electrolyte of embodiment is denoted as C1;

[0044] (2) Preparation of lithium ion battery:

[0045] The positive active material (LiNi 0.5 mn 1.5 o 4 ), acetylene black, and polyvinylidene fluoride in a ratio of 90:5:5 and then pressed on the aluminum foil to obtain the positive electrode sheet; the metal lithium sheet was used as the negative electrode sheet; the PE / PP composite diaphragm was used as the ion exchange membrane. The electrolyte C1 of the example is made into a button battery S1 by a conventional method in the art.

Embodiment 2

[0047] Adopt the same steps as in Example 1 to prepare electrolyte and button cell, the difference is: in step (1), replace 2-chlorobenzothiazole with 2-aminobenzothiazole of 3% by weight, and prepare lithium ion Battery electrolyte C2 and button cell S2.

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Abstract

The invention provides an electrolyte, comprising a lithium salt, an electrolyte solvent and an additive, wherein the additive is a derivative of benzothiazole of the structure shown in the invention.The invention also provides a positive electrode and a lithium ion battery using the electrolyte. In the electrolyte provided by the invention, the derivative of benzothiazole of the structure provided by the invention is used as a specific additive of the invention, thereby improving the charge and discharge performance test and cycle of the lithium battery in a high voltage environment, extending the service life of the battery at a high voltage, and being applicable to the high voltage lithium ion battery electrolyte of the 5V system.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, in particular to an electrolyte and a lithium ion battery containing the electrolyte and / or a positive electrode. Background technique [0002] Since the 1990s, lithium-ion secondary batteries have developed rapidly from their birth. Generally speaking, a lithium-ion battery with an electrolyte includes a casing, a cell contained in the casing, and an electrolyte. The cell includes a positive electrode, a negative electrode, and a separator between the positive electrode and the negative electrode. During charging, lithium ions migrate from the positive electrode through the electrolyte to the negative electrode, while they flow in the opposite direction during discharging. In recent years, secondary lithium-ion batteries with high energy density have become the object of people's attention. Therefore, people have also noticed some new active materials that can be used as secondary lithium b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M4/131H01M10/0525
CPCH01M4/131H01M10/0525H01M10/0567H01M2300/0025Y02E60/10
Inventor 乔飞燕杨洋任建新黄荣刚王圣
Owner HUIZHOU BYD BATTERY
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